Concerning the recent lecture 'Moses the Mystery of Baphomet', during the question period a response was given about an exercise called Vajroli Mudra. (The spelling of Vajroli may be wrong but it sounded similar)

The instructor mentioned that more information on this mudra may be found on the webpage. I was unable to locate the page myself, where might I find more information on this mudra?

Thank you kindly =)